Stock Incentive Plans (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Restricted Common Stock and Performance-Based Restricted Stock Unit Activity

The following table summarizes restricted common stock and performance-based restricted stock unit activity in our stock incentive plans for the three months ended March 31, 2017.

	Restricted Common Stock							Restricted Stock Units
	Number of Shares			Weighted Average Grant Date Fair Value				Number of Units			Weighted Average Grant Date Fair Value
Unvested at January 1, 2017		639,329			$	14.40			705,600			$	12.41
Granted		521,784			19.80				—			—
Vested		(21,790	)		(12.62		)		—			—
Forfeited		(2,910	)		(14.85		)		(1,000	)		(12.64		)
Expired		—			—				(327,800	)	(1)	(12.14		)
Unvested at March 31, 2017		1,136,413			16.91				376,800			12.64

(1) Expired on February 1, 2017. Performance-based conditions were not achieved.